1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This utility may be invoked in the following manner: 11 // llvm-as --help - Output information about command line switches 12 // llvm-as [options] - Read LLVM asm from stdin, write bitcode to stdout 13 // llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode 14 // to the x.bc file. 15 // 16 //===----------------------------------------------------------------------===// 17 18 #include "llvm/IR/LLVMContext.h" 19 #include "llvm/AsmParser/Parser.h" 20 #include "llvm/Bitcode/ReaderWriter.h" 21 #include "llvm/IR/Module.h" 22 #include "llvm/IR/Verifier.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/FileSystem.h" 25 #include "llvm/Support/ManagedStatic.h" 26 #include "llvm/Support/PrettyStackTrace.h" 27 #include "llvm/Support/Signals.h" 28 #include "llvm/Support/SourceMgr.h" 29 #include "llvm/Support/SystemUtils.h" 30 #include "llvm/Support/ToolOutputFile.h" 31 #include <memory> 32 using namespace llvm; 33 34 static cl::opt<std::string> 35 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-")); 36 37 static cl::opt<std::string> 38 OutputFilename("o", cl::desc("Override output filename"), 39 cl::value_desc("filename")); 40 41 static cl::opt<bool> 42 Force("f", cl::desc("Enable binary output on terminals")); 43 44 static cl::opt<bool> 45 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false)); 46 47 static cl::opt<bool> 48 EmitFunctionSummary("function-summary", cl::desc("Emit function summary index"), 49 cl::init(false)); 50 51 static cl::opt<bool> 52 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden); 53 54 static cl::opt<bool> 55 DisableVerify("disable-verify", cl::Hidden, 56 cl::desc("Do not run verifier on input LLVM (dangerous!)")); 57 58 static cl::opt<bool> PreserveBitcodeUseListOrder( 59 "preserve-bc-uselistorder", 60 cl::desc("Preserve use-list order when writing LLVM bitcode."), 61 cl::init(true), cl::Hidden); 62 63 static void WriteOutputFile(const Module *M) { 64 // Infer the output filename if needed. 65 if (OutputFilename.empty()) { 66 if (InputFilename == "-") { 67 OutputFilename = "-"; 68 } else { 69 StringRef IFN = InputFilename; 70 OutputFilename = (IFN.endswith(".ll") ? IFN.drop_back(3) : IFN).str(); 71 OutputFilename += ".bc"; 72 } 73 } 74 75 std::error_code EC; 76 std::unique_ptr<tool_output_file> Out( 77 new tool_output_file(OutputFilename, EC, sys::fs::F_None)); 78 if (EC) { 79 errs() << EC.message() << '\n'; 80 exit(1); 81 } 82 83 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) 84 WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder, 85 EmitFunctionSummary); 86 87 // Declare success. 88 Out->keep(); 89 } 90 91 int main(int argc, char **argv) { 92 // Print a stack trace if we signal out. 93 sys::PrintStackTraceOnErrorSignal(); 94 PrettyStackTraceProgram X(argc, argv); 95 LLVMContext &Context = getGlobalContext(); 96 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 97 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n"); 98 99 // Parse the file now... 100 SMDiagnostic Err; 101 std::unique_ptr<Module> M = parseAssemblyFile(InputFilename, Err, Context); 102 if (!M.get()) { 103 Err.print(argv[0], errs()); 104 return 1; 105 } 106 107 if (!DisableVerify) { 108 std::string ErrorStr; 109 raw_string_ostream OS(ErrorStr); 110 if (verifyModule(*M.get(), &OS)) { 111 errs() << argv[0] 112 << ": assembly parsed, but does not verify as correct!\n"; 113 errs() << OS.str(); 114 return 1; 115 } 116 } 117 118 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get(); 119 120 if (!DisableOutput) 121 WriteOutputFile(M.get()); 122 123 return 0; 124 } 125